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Amorphous MnO2 and preparation method and application thereof

A manganese dioxide, amorphous technology, applied in the field of materials, can solve the problems of increasing the cost of lithium ion batteries, restricting the application of lithium ion batteries, shortage of lithium resources, etc., achieving good cycle stability, low reaction environment requirements, and high specific capacity. Effect

Active Publication Date: 2018-10-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, with the large-scale use of lithium batteries, the reserves of lithium resources on the earth are not ideally sufficient, which has caused the shortage of lithium resources and the subsequent increase in lithium prices, and the cost of lithium-ion batteries has greatly increased. Will restrict the application of lithium-ion batteries in the field of energy storage

Method used

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  • Amorphous MnO2 and preparation method and application thereof
  • Amorphous MnO2 and preparation method and application thereof
  • Amorphous MnO2 and preparation method and application thereof

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Embodiment

[0028] At room temperature, 1.58g KMnO 4 and 3.68g Mn(CH 3 COO) 2 4H 2 O were prepared into 50mL solutions with deionized water, KMnO 4 The solution was magnetically stirred, and then the Mn(CH 3 COO) 2 4H 2 O solution was added dropwise to KMnO 4 solution, stirred for 5 minutes to form a homogeneous solution. Prepare 10mL of KOH solution with a concentration of 0.16g / L, add it to the above homogeneous solution, and keep magnetic stirring at room temperature for 4 hours to obtain a dark brown precipitate, wash it with deionized water and absolute ethanol several times, and put the precipitate in an oven Dry at 85°C for 12h, grind evenly with a mortar, and calcinate at 400°C for 3h in an air atmosphere to obtain a sample of manganese dioxide.

[0029] The synthesized MnO 2 Materials and conductive agent (graphite: carbon black = 4:6) are mixed in a ball mill jar according to the mass ratio of 7:2, dry milled in a planetary ball mill for two hours, and then wet milled f...

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Abstract

The invention relates to amorphous MnO2 and preparation method and application thereof. The preparation method comprises the following steps of (1) mixing a KMnO4 solution and a Mn(CH<3>COO)<2>.4H<2>Oto prepare a uniform solution; (2) adding a KOH solution into the uniform solution obtained in the step (1), and performing stirring to obtain a deep brown precipitant; and (3) washing, drying, grinding and calcining the deep brown precipitant obtained in the step (2) to obtain an amorphous MnO2 material. The prepared amorphous MnO2 is used for a sodium ion battery positive electrode material. Compared with the prior art, the synthesis process is simple, the reaction condition is simple, the reaction environment requirement is low, and the preparation method is suitable of industrialization on a large scale; the amorphous MnO2 material is used as the sodium ion battery positive electrode material and has relatively large specific area, the sodium ion mobility is greatly improved, relatively high specific capacity and favorable cycle stability are shown.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method and application of amorphous manganese dioxide. Background technique [0002] In today's environment where fossil fuels are in short supply and environmental problems are becoming more and more prominent, the development and use of new green energy sources are getting more and more attention. At present, the most widely studied new energy systems include solar energy, geothermal energy, wind energy and other energy systems. However, these systems have intermittent problems, so they cannot be effectively used on a large scale. The key to solving this problem lies in the development of energy storage technology. Among the current energy storage technologies, chemical energy storage has become the most widely used energy storage method because of its simplicity and high efficiency. In chemical energy storage, lithium-ion batteries have attracted the most attention. L...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/86H01G11/30
CPCH01G11/30H01G11/46H01G11/86Y02E60/13
Inventor 张俊喜陈曈曹永杰周义荣夏修萍任平
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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